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Pathways of proteolysis affecting renal cell growth
1Renal Division, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA; and Atlanta Veterans Affairs Medical Center, Decatur, Georgia, USA. hfranch@emory.edu
Current Opinion in Nephrology and Hypertension
|July 10, 2002
Summary
Protein breakdown suppression is key to kidney growth. The ubiquitin-proteasome pathway regulates specific substrates, while lysosomal pathways reduce general protein breakdown during renal hypertrophy.
Area of Science:
- Cell biology
- Molecular biology
- Renal physiology
Background:
- Protein breakdown is crucial for adult kidney growth and renal hypertrophy.
- Understanding proteolysis control pathways and their substrates is essential for kidney research.
Purpose of the Study:
- Review the role of the ubiquitin-proteasome pathway in regulating specific substrates during kidney growth.
- Examine the function of lysosomal pathways in suppressing general protein breakdown and specific substrates during renal hypertrophy.
Main Methods:
- Literature review focusing on ubiquitin-proteasome and lysosomal pathways in kidney growth.
- Analysis of studies investigating substrate regulation by ubiquitin ligases and autophagy.
Main Results:
- Specific ubiquitin ligases control the destruction of growth-related substrates like hypoxia-inducible factors and p27.
- Growth factors suppress chaperone-mediated autophagy, increasing KFERQ motif-containing proteins.
- Phosphoinositol 3-kinase activity regulates lysosomal proteolysis in renal cells.
Conclusions:
- Ubiquitin ligases are key signaling intermediates for cell growth, while lysosomal pathways manage global proteolysis reduction.
- KFERQ motifs identify proteins vital for renal growth, including metabolic enzymes and signaling molecules.
- Regulation of intracellular trafficking by phosphoinositol 3-kinase may influence lysosomal proteolysis during kidney growth.